JP2005292642A - Light source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To uniformize each light intensity distribution emitted by a plurality of semiconductor light emitting devices. <P>SOLUTION: A light source device 10A comprises a printed circuit board 11 with a through hole 11a penetrated therein; the plurality of semiconductor light emitting devices 12 that are attached centering around a hole 11a in one surface 11b of the printed circuit board 11; a light integrator 15 that is fitted in the hole 11a of the printed circuit board 11, and has a light incidence end 11c protruded to one surface 11b side of the printed circuit board 11 and also has a light emission end 11d protruded to other surface 11c side of the printed circuit board 11; a plurality of condenser lenses 16 which are arranged opposite to the plurality of semiconductor light emitting devices 12, respectively, for converting each light emitted from the plurality of semiconductor light emitting devices 12 into parallel light; and a reflection condensing mirror 17, which are arranged opposite to the plurality of condenser lens 16, and which reflects back each parallel light from the plurality of condenser lens 16 for condensing in the vicinity of a light incidence end 15c of the light integrator 15. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is applied to a projection display device, and relates to a light source device capable of uniformizing the intensity distribution (in-plane luminance) of each light emitted from a plurality of semiconductor light emitting elements.

  Recently, projection display devices for displaying high-definition color images typified by high-definition broadcasting standards and UXGA (Ultra eXtended Graphics Array) standards for computer graphics on a large screen are actively used.

  The above-described projection type display device employs a transmissive or reflective spatial light modulator (for example, a liquid crystal panel) as an image display device for displaying a color image, or a DMD (Digital Micromirror Device). In addition, there are a single plate method that displays RGB three colors in a time-division manner depending on the number of image display devices used in the projection display device, and a three-plate method that displays RGB three colors separately. Although various structural forms are applied as a projection display device by a combination of these, there is a projection display device using a single-plate DMD that has recently attracted attention among the above (for example, Patent Document 1). reference).

In addition, as a light source device used for a projection display device, there is a light source device that uses a light emitting diode (LED) array that consumes less power, generates a small amount of heat, and has a long life (for example, see Patent Document 2). .
JP 2000-78602 A (page 3-4, FIG. 1) Japanese Patent No. 3319438 (page 4-5, FIG. 2).

  FIG. 14 is a block diagram showing an image display device of Conventional Example 1. The image display device 100 of Conventional Example 1 shown in FIG. 14 is disclosed in the above-described Patent Document 1 (Japanese Patent Laid-Open No. 2000-78602), and is briefly described here with reference to Patent Document 1. To do.

  As shown in FIG. 14, in the image display apparatus 100 of the first conventional example, white light emitted from a lamp 101 serving as a light source is converted into red (R) light, green ( G) light and blue (B) light are separated, and each separated color light is incident on a DMD (Digital Micromirror Device) 103 having a large number of micro movable mirrors (not shown) attached thereto. Here, in the DMD 103, a large number of minute movable mirrors are integrated on one chip, and each color light is incident on the projection lens side by changing the tilt of each color light incident on the chip for each minute movable mirror. The ON state to be turned on and the OFF state in which each color light is not incident on the projection lens side are selectively controlled.

  On the other hand, R, G, and B color signals are input to the time division multiplexing circuit 104, and the order of colors generated by the color wheel 102 in accordance with the color sequence signal from the color sequence control circuit 105 in the time division multiplexing circuit 104 is as follows. The G, R, and B signals are time-divisionally supplied to the DMD 103 in the same color order. At this time, the color wheel 102 has R, G, B filters for every 40 ° with respect to each 120 ° block divided into three.

  Thereafter, the G, R, and B color lights are reflected by the DMD 103 controlled by the G, R, and B signals, respectively, and the emitted G, R, and B image lights are emitted from the screen S. The images are irradiated in order and displayed as a color image. At this time, since the signals of the respective colors are supplied to the DMD 103 in a time-division manner while repeating the signals of each color at a high speed in a time shorter than the human visual reaction time, the image light of each color emitted from the DMD 103 is generated by the human vision. It is integrated over time and recognized as a color image including white.

  The image display device 100 according to the above-described conventional example 1 is being adopted in many projection type display devices because the configuration of the optical system is simple and it is suitable for miniaturization.

  On the other hand, use of a semiconductor light emitting element such as an LED as a light source device applied to a projection display device for outputting such a color image has been studied.

  FIGS. 15A and 15B are views for explaining the light source device of the second conventional example. The light source device 200 of the conventional example 2 shown in FIGS. 15A and 15B is disclosed in the above-described Patent Document 2 (Japanese Patent No. 3319438), and here, Patent Document 2 is referred to. Will be briefly described.

  As shown in FIG. 15A, in the light source device 200 of the conventional example 2, two red LEDs are arranged on the R substrate 202R so as to face the three side surfaces orthogonal to each other in the dichroic prism 201. Dimensionally arranged red LED array 203R, lens array 204R facing red LED array 203R, green LED array 203G two-dimensionally arranged on green substrate 202G, and green LED A lens array 204G facing the array 203G, a blue LED array 203B in which a plurality of blue LEDs are two-dimensionally arranged on the B substrate 202B, and a lens array 204B facing the blue LED array 203B are arranged. .

  At this time, as shown in FIG. 15B, for example, in the red LED array 203R, the red LEDs are integrated in a matrix of 5 × 4 columns, and each red LED emits light at the same timing. The red light emitted from the red LED array 203R is converted into highly parallel light by the lens array 204R, and then incident on the dichroic prism 201.

  Then, the red light emitted from the red LED array 203R is reflected by the red reflecting mirror of the dichroic prism 201. Further, the green light emitted from the green LED array 203G passes through the dichroic prism 101. Further, the blue light emitted from the blue LED array 203B is reflected by the blue reflecting mirror. In this way, in the dichroic prism 101, red light, green light, and blue light are combined and emitted as white light from the side surface where the LED arrays 203R, 203G, and 203B of the respective colors are not arranged.

  By the way, in the image display apparatus 100 of the above-described conventional example 1, there are an ultra-high pressure mercury lamp, a metal halide lamp, a xenon lamp, and the like as the lamp 101 that emits white light. It is necessary to attach an IR-UV cut filter or the like for removing infrared or ultraviolet light from the emitted white light.

  Therefore, if the red LED array 203R, the green LED array 203G, and the blue LED array 203B used in the light source device 200 of the above-described conventional example 2 are used in place of the lamp 101 that emits white light, the power consumption can be reduced. However, the following new problems will occur, although low heat generation and long life can be achieved.

  That is, due to the light emission variation between the individual LEDs in the RGB LED arrays 203R, 203G, and 203B, the light emission luminance of each color light is not necessarily the same in the plane, and if this is different for R, G, and B, When white light is displayed, color irregularities appear and the image display quality is significantly reduced.

  Therefore, there is a demand for a light source device that can be applied to a projection display device and can uniformize the intensity distribution (in-plane luminance) of light emitted from a plurality of semiconductor light emitting elements.

The present invention has been made in view of the above problems, and the invention according to claim 1 is a light source device applied to a projection display device.
A wiring board having a through-hole formed therein;
A plurality of semiconductor light emitting devices attached to one surface of the wiring board around the hole;
Light that is fitted in the hole of the wiring board and has a light incident end projecting toward the one surface of the wiring board and a light emitting end projecting toward the other surface of the wiring board An integrator,
A plurality of condensing lenses which are respectively provided facing the plurality of semiconductor light emitting elements and convert each light emitted from the plurality of semiconductor light emitting elements into parallel light;
A reflective condensing mirror that is provided opposite to the plurality of condensing lenses and that reflects each parallel light from the plurality of condensing lenses and condenses the light in the vicinity of the light incident end of the optical integrator; With
The optical integrator has a through-hole formed in the frame portion from the light incident end portion toward the light emitting end portion, and is condensed by the reflection / condensing mirror and incident from the light incident end portion. The light source device is characterized in that a reflection surface is formed along an inner wall surface of the through hole in order to make the intensity distribution of the emitted light uniform and emit from the light emitting end.

The invention of claim 2 is a light source device applied to a projection display device.
A wiring board having a through-hole formed therein;
A plurality of semiconductor light emitting devices attached to one surface of the wiring board around the hole;
Light that is fitted in the hole of the wiring board and has a light incident end projecting toward the one surface of the wiring board and a light emitting end projecting toward the other surface of the wiring board An integrator,
A plurality of condensing lenses which are respectively provided facing the plurality of semiconductor light emitting elements and convert each light emitted from the plurality of semiconductor light emitting elements into parallel light;
A reflective condensing mirror that is provided opposite to the plurality of condensing lenses and that reflects each parallel light from the plurality of condensing lenses and condenses the light in the vicinity of the light incident end of the optical integrator; With
The optical integrator has a through-hole formed in the frame portion from the light incident end portion toward the light emitting end portion, and is condensed by the reflection / condensing mirror and incident from the light incident end portion. The light source device is characterized in that a relay lens and two microlens arrays are accommodated in the through hole so as to make the intensity distribution of the emitted light uniform and output from the light emitting end. .

Furthermore, the invention described in claim 3 is the light source device of the invention described in claim 1 or 2, wherein
In the light source device, a polarization conversion plate is provided in close contact with or close to the light emitting end portion of the optical integrator.

  According to the first aspect of the present invention, in particular, each light emitted from a plurality of semiconductor light emitting elements is converted into parallel light by a plurality of condensing lenses, and each parallel light is reflected by a reflection condensing mirror, thereby providing an optical integrator. After the light condensed near the light incident end is made incident from the light incident end, the light incident on the light incident end is applied to the inner wall surface in the through hole formed in the frame portion of the optical integrator. Since the light is emitted from the light exit end of the light integrator, the light reflected from the reflecting surface formed along the surface can have a uniform intensity distribution, which is a good illumination light for application to a projection display device. Is obtained.

  According to the second aspect of the invention, in particular, each light emitted from a plurality of semiconductor light emitting elements is converted into parallel light by a plurality of condensing lenses, and each parallel light is reflected by a reflective condensing mirror. After the light collected near the light incident end of the light integrator is incident from the light incident end, the light incident on the light incident end is stored in a through hole formed in the frame of the optical integrator. Since the relay lens and the two microlens arrays are passed, the light emitted from the light exit end of the light integrator can have a uniform intensity distribution, which is good for application to a projection display device Illuminating light.

  According to the invention described in claim 3, in particular, since the polarization conversion plate is provided in close contact with or close to the light emitting end portion of the optical integrator, the light whose intensity distribution is made uniform from the light emitting end portion of the optical integrator. The light can be emitted from the polarization conversion plate in a state where the phase is aligned and the light use efficiency is enhanced.

  Hereinafter, an embodiment of a light source device according to the present invention will be described in detail in the order of Embodiment 1 to Embodiment 6 with reference to FIGS. 1 to 13.

FIG. 1 is a configuration diagram illustrating an example in which the light source device according to the first embodiment of the present invention is applied to the projection display device according to the first embodiment.
FIG. 2 is a perspective view showing a state in which a plurality of white LEDs that emit white light as a plurality of semiconductor light emitting elements and an optical integrator are attached to a printed wiring board in the light source device according to the first embodiment of the present invention;
FIG. 3 shows a plurality of red LEDs, green LEDs, blue LEDs and light integrators that emit red light, green light, and blue light as a plurality of semiconductor light emitting elements in the light source device according to the first embodiment of the present invention. The perspective view which showed the state attached to the board | substrate,
FIG. 4 schematically shows a state in which light from a plurality of semiconductor light emitting elements is repeatedly reflected and uniformed by a reflecting surface formed in a quadrangular columnar frame of an optical integrator in the light source device according to the first embodiment of the present invention. The figure shown,
FIG. 5 schematically shows a state in which light from a plurality of semiconductor light emitting elements is made uniform by a relay lens and two microlens arrays housed in a square columnar frame of an optical integrator in the light source device of Example 1 according to the present invention. FIG.

  As shown in FIG. 1, the light source device 10 </ b> A according to the first embodiment of the present invention is applied to the projection display device 1 </ b> A according to the first embodiment that can enlarge and project an image using a light transmission type liquid crystal panel 45 with a single plate method. Has been. At this time, the projection display apparatus 1A of Example 1 is roughly configured by a light source device 10A, an image display optical system 30A, and a projection lens 50 serving as a projection optical system.

  First, in the light source device 10A according to the first embodiment, a rectangular hole 11a that is long in the horizontal direction and short in the vertical direction is formed through a substantially central portion of a wiring board (hereinafter referred to as a printed wiring board) 11 so as to penetrate therethrough. A plurality of semiconductor light emitting elements 12 are attached to one surface 11b around the rectangular hole 11a by, for example, radial soldering. As the plurality of semiconductor light emitting elements 12 described above, there are known LEDs (Light Emitting Diodes), known semiconductor lasers, electroluminescence, and the like. Hereinafter, the plurality of semiconductor light emitting elements 12 will be described as a plurality of LEDs.

  Here, when a plurality of LEDs 12 are arranged on one surface 11b of the printed wiring board 11, a plurality of white LEDs 12W that emit white light are arranged as the plurality of LEDs 12, as shown in FIG. As shown in FIG. 4, any one of the plurality of LEDs 12 in which a plurality of red LEDs 12R, green LEDs 12G, and blue LEDs 12B that respectively emit red light, green light, and blue light are arranged in a predetermined arrangement is used.

  At this time, as shown in FIG. 3, when a plurality of red LEDs 12 R, green LEDs 12 G, and blue LEDs 12 B are arranged on one surface 11 b of the printed wiring board 11, the red color is centered on the rectangular hole 11 a of the printed wiring board 11. The LED 12R, the green LED 12G, and the blue LED 12B are repeatedly arranged in the order of RGB, or the red LED 12R, the green LED 12G, and the blue LED 12B are arranged in accordance with the light emission luminance ratio. 2 and 3, a wiring connector 13 is soldered to the left side surface on one surface 11 b of the printed wiring board 11.

  Further, a heat radiating plate (heat sink) 14 is attached to the other surface 11c opposite to the one surface 11b of the printed wiring board 11, if necessary, and the heat radiating plate 14 generates heat generated from the plurality of LEDs 12. Installed when large.

  In addition, an optical integrator 15 that is a main part of the first embodiment is fitted at a substantially right angle with respect to the printed wiring board 11 in a rectangular hole 11 a that is formed by penetrating a substantially central portion of the printed wiring board 11. ing.

  As shown in FIGS. 2 and 3, the above-described optical integrator 15 is an optical integrator 15A (FIG. 4) based on a rod integrator, which will be described later. However, the optical integrator 15 has a rectangular columnar shape inside a long rectangular columnar frame portion 15a. The through-hole 15b is drilled through, the light incident end portion 15c protrudes to the one surface 11b side of the printed wiring board 11 to which the plurality of LEDs 12 are soldered, and the light emitting end portion 15d is printed. Projecting to the other surface 11 c side of the wiring substrate 11. The light integrator 15 has a function of emitting illumination light having a uniform intensity distribution (in-plane luminance) of each light when the light emitted from the plurality of LEDs 12 is incident. It will be described later.

  A plurality of condensing lenses 16 are arranged in front of the plurality of LEDs 12 soldered to the one surface 11 b of the printed wiring board 11 so as to face the respective LEDs 12. Further, in front of the light incident end portion 15 c of the optical integrator 15, a reflection / condensing mirror 17 is disposed so as to face the plurality of condensing lenses 16 and to form a concave spherical or concave aspherical reflecting surface 17 a. Yes. At this time, the optical integrator 15 and the reflection / condensing mirror 17 are arranged with their optical axes aligned.

  Each light emitted from the plurality of LEDs 12 is shaped into parallel light by the plurality of condensing lenses 16, and then each parallel light is incident on the reflecting surface 17a of the reflecting condensing mirror 17, and the reflecting surface 17a. And is collected at a substantially central portion in the vicinity of the light incident end 15c of the optical integrator 15.

  At this time, the optical integrator 15 employs either the rod integrator method 15A as shown in FIG. 4 or the lens array method 15B as shown in FIG.

  That is, in the optical integrator 15A (15) of the rod integrator type as shown in FIG. 4, the long square columnar frame portion 15a has a rectangular cross section substantially similar to an image display surface of the liquid crystal panel 45 described later. This cross section is set to substantially correspond to an aspect ratio of 4: 3 or 16: 9, for example. Further, a rectangular columnar through hole 15b is drilled through from the light incident end 15c of the square columnar frame portion 15a of the optical integrator 15A toward the light emitting end 15d, and the inside of the rectangular columnar through hole 15b is formed. A reflecting surface 15b1 having four parallel surfaces along the wall surface is mirror-finished using aluminum, silver, or the like.

  Then, the light collected from the plurality of LEDs 12 by the reflecting surface 17a of the reflecting / condensing mirror 17 through the plurality of condensing lenses 16 is incident from the light incident end 15c of the light integrator 15. The light incident on the light incident end 15c repeats multiple reflections at the reflecting surface 15b1 in the square columnar through hole 15b, and the intensity distribution (in-plane) of the emitted light is near the light emitting port on the light emitting end 15d side. (Luminance) is emitted as uniform illumination light.

  More specifically, the light collected near the light incident port of the light incident end 15c of the light integrator 15 proceeds while repeating total reflection at the reflecting surface 15b1 in the rectangular columnar through hole 15b, and reaches the light emitting end. A plurality of images corresponding to the number of reflections on the reflecting surface 15b1 are formed in the vicinity of the relay lens 32 by the action of an exit lens 31 provided in an image display optical system 30A described later provided on the part 15d side. As a result, the illumination is superimposed by a plurality of light sources, and the light source image having a non-uniform distribution is also integrated and averaged. As a result, the illumination light emitted from the light emitting end 15c of the light integrator 15 has a uniform intensity distribution (uniform In-plane luminance).

  On the other hand, in the optical integrator 15B (15) by the lens array system as shown in FIG. 5, the long rectangular columnar frame portion 15a has a rectangular cross section substantially similar to an image display surface of the liquid crystal panel 45 described later. This cross section is also set substantially corresponding to an aspect ratio of 4: 3 or 16: 9, for example. Further, a rectangular columnar through hole 15b is drilled from the light incident end 15c of the square columnar frame portion 15a of the optical integrator 15B toward the light emitting end 15d, and light is transmitted through the square columnar through hole 15b. The relay lens 18 and the two first and second microlens arrays 19A and 19B are housed at a distance from the incident end 15c toward the light exit end 15d.

  At this time, of the two first and second microlens arrays 19A and 19B, the first microlens array 19A arranged on the light incident side has a plurality of microlenses 19a1 set on the light incident side so that their optical axes are parallel to each other. The two-dimensionally arranged rectangular shape, and the opposite side is formed on the flat surface 19a2. On the other hand, the second microlens array 19B arranged on the light emission side has the same shape as the first microlens array 19A and is arranged symmetrically in the front-rear direction, and the flat surface 19a2 of the first microlens array 19A A flat surface 19b2 is formed oppositely, and on the opposite side, a plurality of microlenses 19b1 are arranged two-dimensionally in a rectangular shape with the optical axes set in parallel to each other on the light emission side.

  Then, the light collected from the plurality of LEDs 12 by the reflecting surface 17a of the reflecting / condensing mirror 17 through the plurality of condensing lenses 16 is incident from the light incident end 15c of the light integrator 15. The light incident on the light incident end 15c is incident on the first microlens array 19A via the relay lens 18 in the square columnar through hole 15b, and a plurality of light beams incident on the first microlens array 19A The same number of secondary light source images as the plurality of microlens lenses 19a1 are formed in a plane perpendicular to the optical axis by the condensing action of the microlens lenses 19a1. On the other hand, since the second microlens array 19B is arranged in the plane perpendicular to the optical axis in the vicinity of the secondary light source image by the first microlens array 19A, the chief ray of the illumination light from the second microlens 19B is The intensity distribution (in-plane luminance) is made uniform and emitted in a state of being parallel to each other.

  Here, returning to FIG. 1 again, from the light emitting end portion 15d of the light integrator 15 (15A or 15B), uniform light whose direction is changed by 180 ° with respect to the emitting direction of the light emitted from the plurality of LEDs 12 is obtained. After that, the light is incident on the image display optical system 30A installed at the light emitting end 15d.

  In the above-described image display optical system 30A, the emission lens 31, the relay lens 32, the condenser lens 33, and the light transmission type liquid crystal panel 45 are arranged in the light integrator 15 in this order from the light emission end 15d side of the light integrator 15. On the other hand, the optical axes are aligned. Further, a projection lens 50 serving as a projection optical system is installed on the light emission side of the liquid crystal panel 45.

  The illumination light having a uniform intensity distribution emitted from the light exit end 15d side of the optical integrator 15 passes through the exit lens 31, the relay lens 32, and the condenser lens 33 in this order and becomes uniform parallel light. The image light incident on the rear surface of the transmissive liquid crystal panel 45 and modulated in accordance with the image signal is projected on the screen S by the projection lens 50 from the surface of the liquid crystal panel 45.

  As described above, the intensity distribution of the illumination light emitted from the light source device 10 </ b> A according to the first embodiment is uniformized by the optical integrator 15. Therefore, when the white LEDs 12 </ b> W are used as the plurality of LEDs 12, The white image light projected from the liquid crystal panel 45 through the projection lens 50 is satisfactorily displayed on the screen S without illuminance unevenness and brightness unevenness. On the other hand, when the red LED 12R, the green LED 12G, and the blue LED 12B are used as the plurality of LEDs 12. The three primary color image lights projected from the liquid crystal panel 45 through the projection lens 50 by the three primary color illumination lights are displayed on the screen S satisfactorily without color unevenness.

  FIG. 6 is a configuration diagram showing an example in which the light source device according to the second embodiment of the present invention is applied to the projection display device according to the second embodiment.

  As shown in FIG. 6, the projection display device 1B of the second embodiment to which the light source device 10B of the second embodiment according to the present invention is applied has the same configuration except for the configuration of the first embodiment described above. Here, for convenience of explanation, the same reference numerals are given to the constituent members shown above, and the constituent members shown above will be described as necessary, and differ from the first embodiment. A description will be given focusing on the different points by attaching new reference numerals to the constituent members.

  That is, the light source device 10B according to the second embodiment of the present invention is also applied to the projection display device 1B according to the second embodiment that can enlarge and project an image using the light transmission type liquid crystal panel 45 by a single plate method. At this time, the projection display device 1B of Example 2 is roughly configured by a light source device 10B, an image display optical system 30B, and a projection lens 50 serving as a projection optical system.

  In the light source device 10B described above, the optical integrator 15A (15) based on the rod integrator method described above is fitted in the rectangular hole 11a formed in the printed wiring board 11. In addition, a plurality of semiconductor light emitting elements 12 are attached, for example, radially by soldering on one surface 11b around a rectangular hole 11a drilled in the printed wiring board 11, and light emitted from the plurality of semiconductor light emitting elements 12 is emitted. Are collected by a plurality of condensing lenses 16 and a reflective condensing mirror 17 having a concave spherical or concave aspherical reflecting surface 17a, and the light incident end of the rectangular columnar frame portion 15a of the optical integrator 15A. Illuminating light having a uniform intensity distribution from the light exit end 15d by being incident from the portion 15c and multiple-reflecting this incident light by the reflecting surface 15b1 in the rectangular columnar through hole 15b drilled through the rectangular columnar frame portion 15a. The technical idea of emitting light is the same as that of the first embodiment.

  Here, the difference from the first embodiment is that the polarization conversion plate 20 is provided so as to adhere to or approach the light emitting end 15d of the optical integrator 15A.

  The above-described polarization conversion plate 20 has a function of converting the polarization direction to a direction different by 90 ° with respect to the illumination light emitted from the light emitting end portion 15d of the light integrator 15A, that is, the light emission of the light integrator 15A. Illumination light emitted from the end portion 15d passes through the polarization conversion plate 20, and image display to be described later is performed in a state where the light whose phase is aligned as the p-polarized light or the s-polarized light from the polarization conversion plate 20 is enhanced. The light is emitted to the optical system 30B side.

  In this case, when white LEDs 12W are used as the plurality of LEDs 12, Wp light or Ws light corresponding to p-polarized light or s-polarized light is emitted from the polarization conversion plate 20 (not shown). On the other hand, when the red LED 12R, the green LED 12G, and the blue LED 12B are used as the plurality of LEDs 12, the Rp light, the Gp light, the Bp light corresponding to the p-polarized light or the s-polarized light from the polarization conversion plate 20 although not illustrated, or Rs light, Gs light, and Bs light are emitted.

  An image display optical system 30B is installed on the light exit side of the polarization conversion plate 20.

  In the image display optical system 30B described above, the relay lens 32, the condenser lens 33, and the light transmission type liquid crystal panel 45 are arranged in order from the light exit side of the polarization conversion plate 20 with the optical axis aligned with the optical integrator 15A. Is provided. Further, a projection lens 50 serving as a projection optical system is installed on the light emission side of the liquid crystal panel 45.

  The p-polarized light or s-polarized illumination light emitted from the light exit end 15d side of the optical integrator 15A through the polarization conversion plate 20 is in a state where the intensity distribution is uniform and the phase is aligned to improve the light use efficiency. The light passes through the relay lens 32 and the condenser lens 33 in order to become uniform parallel light, which is incident on the back surface of the light transmission type liquid crystal panel 45, where the image light modulated according to the image signal is the surface of the liquid crystal panel 45. Is projected onto the screen S by the projection lens 50.

  As described above, the intensity distribution of the p-polarized light or s-polarized illumination light emitted from the light source device 10B according to the second embodiment is made uniform by the optical integrator 15A, and the light is used by aligning the phase by the polarization conversion plate 20. Since the white LED 12W is used as the plurality of LEDs 12, the white image light projected from the liquid crystal panel 45 through the projection lens 50 by the white illumination light is uneven on the screen S. In addition, when the red LED 12R, the green LED 12G, and the blue LED 12B are used as the plurality of LEDs 12, they are projected from the liquid crystal panel 45 through the projection lens 50 by the illumination light of the three primary colors. The three primary color image lights displayed on the screen S are more satisfactorily displayed than the first embodiment without color unevenness.

  FIG. 7 is a configuration diagram showing an example in which the light source device according to the third embodiment of the present invention is applied to the projection display device according to the third embodiment.

  As shown in FIG. 7, the projection display device 1C according to the third embodiment to which the light source device 10C according to the third embodiment of the present invention is applied has the same configuration except for the configuration of the first embodiment described above. Here, for convenience of explanation, the same reference numerals are given to the constituent members shown above, and the constituent members shown above will be described as necessary, and differ from the first embodiment. A description will be given focusing on the different points by attaching new reference numerals to the constituent members.

  That is, the light source device 10C according to the third embodiment of the present invention is also applied to the projection display device 1C according to the third embodiment that can enlarge and project an image using the light transmission type liquid crystal panel 45 in a single plate system. At this time, the projection display device 1C of Example 3 is roughly configured by a light source device 10C, an image display optical system 30C, and a projection lens 50 serving as a projection optical system.

  In the light source device 10 </ b> C described above, the optical integrator 15 </ b> B (15) using the lens array method described above is fitted in the rectangular hole 11 a formed in the printed wiring board 11. In addition, a plurality of semiconductor light emitting elements 12 are attached, for example, radially by soldering on one surface 11b around a rectangular hole 11a drilled in the printed wiring board 11, and light emitted from the plurality of semiconductor light emitting elements 12 is emitted. Are condensed by a plurality of condensing lenses 16 and a reflective condensing mirror 17 having a concave spherical or concave aspherical reflecting surface 17a, and the light incident end of the rectangular columnar frame portion 15a of the optical integrator 15B. And the relay lens 18 accommodated in the square columnar through hole 15b formed by penetrating the incident light from the portion 15c and penetrating through the rectangular columnar frame portion 15a, and the two first and second microlens arrays 19A and 19B. The technical idea of emitting illumination light having a uniform intensity distribution from the light emitting end 15d is the same as that of the first embodiment.

  Here, the difference from the first embodiment is that the polarization conversion plate 20 is provided so as to adhere to or approach the light emitting end 15d of the optical integrator 15B.

  The polarization conversion plate 20 has a function of converting the polarization direction into a direction different by 90 ° with respect to the illumination light emitted from the light exit end 15d of the optical integrator 15B. That is, the illumination light is converted into the polarization conversion plate. By passing the light 20, light having the same phase as p-polarized light or s-polarized light is emitted from the polarization conversion plate 20 to the image display optical system 30 </ b> C side, which will be described later, in a state where utilization efficiency is increased.

  In this case, when white LEDs 12W are used as the plurality of LEDs 12, Wp light or Ws light corresponding to p-polarized light or s-polarized light is emitted from the polarization conversion plate 20 (not shown). On the other hand, when the red LED 12R, the green LED 12G, and the blue LED 12B are used as the plurality of LEDs 12, the Rp light, the Gp light, the Bp light corresponding to the p-polarized light or the s-polarized light from the polarization conversion plate 20 although not illustrated, or Rs light, Gs light, and Bs light are emitted. Further, an image display optical system 30C is installed on the light exit side of the polarization conversion plate 20.

  In the image display optical system 30C described above, the overlapping lens 34, the condenser lens 35, and the light transmission type liquid crystal panel 45 align the optical axis with respect to the optical integrator 15B in order from the light exit side of the polarization conversion plate 20. Is provided. Further, a projection lens 50 serving as a projection optical system is installed on the light emission side of the liquid crystal panel 45.

  The p-polarized light or s-polarized illumination light emitted from the light exit end 15d side of the optical integrator 15B through the polarization conversion plate 20 is in a state where the intensity distribution is uniform and the phase is aligned to improve the light use efficiency. The light passes through the superimposing lens 34 and the condenser lens 35 in order to become uniform parallel light, which is incident on the back surface of the light transmission type liquid crystal panel 45, where the image light modulated in accordance with the image signal is the surface of the liquid crystal panel 45. Is projected onto the screen S by the projection lens 50.

  As described above, the intensity distribution of the p-polarized light or s-polarized illumination light emitted from the light source device 10C according to the third embodiment is made uniform by the optical integrator 15B, and the light is used by aligning the phase by the polarization conversion plate 20. Since the white LED 12W is used as the plurality of LEDs 12, the white image light projected from the liquid crystal panel 45 through the projection lens 50 by the white illumination light is uneven on the screen S. In addition, when the red LED 12R, the green LED 12G, and the blue LED 12B are used as the plurality of LEDs 12, they are projected from the liquid crystal panel 45 through the projection lens 50 by the illumination light of the three primary colors. The three primary color image lights displayed on the screen S are more satisfactorily displayed than the first embodiment without color unevenness.

  FIG. 8 is a configuration diagram showing an example in which the light source device according to the first embodiment of the present invention is applied to the projection display device according to the fourth embodiment.

  As shown in FIG. 8, the projection display device 1D according to the fourth embodiment to which the light source device 10A according to the first embodiment of the present invention is applied has the same configuration except for the configuration of the first embodiment described above. Here, for convenience of explanation, the same reference numerals are given to the constituent members shown above, and the constituent members shown above will be described as necessary, and differ from the first embodiment. A description will be given focusing on the different points by attaching new reference numerals to the constituent members.

  In other words, the light source device 10A according to the first embodiment of the present invention is applied to the projection display device 1D according to the fourth embodiment that can enlarge and project an image using a light-transmitting liquid crystal panel 45 in a single plate system. At this time, the projection display apparatus 1D of Example 4 is roughly configured by a light source device 10A, an image display optical system 30D, and a projection lens 50 serving as a projection optical system.

  In the fourth embodiment, the light source device 10A of the first embodiment described above is applied, and the optical integrator 15 in the light source device 10A uses the rod integrator type optical integrator 15A. The polarization conversion plate is not provided in close contact with or close to the light exit end 15d.

  Here, the difference from the first embodiment is that a polarization conversion plate 38 is provided in the image display optical system 30D installed on the light emitting end 15d side of the optical integrator 15A.

  That is, the above-described image display optical system 30D includes, in order from the light exit end 15d side of the optical integrator 15A, the exit lens 36, the relay lens 37, the polarization conversion plate 38, the overlapping lens 39, and the condenser lens 40. A light transmission type liquid crystal panel 45 is provided with its optical axis aligned with the optical integrator 15A. Further, a projection lens 50 serving as a projection optical system is installed on the light emission side of the liquid crystal panel 45.

  The polarization conversion plate 38 provided in the image display optical system 30D described above also has a function of converting the polarization direction into a direction different by 90 ° with respect to the illumination light emitted from the light exit end 15d of the optical integrator 15A. That is, the illumination light from the optical integrator 15A passes through the polarization conversion plate 20 provided in the image display optical system 30D, so that the phase of the light as p-polarized light or s-polarized light is aligned and the light utilization efficiency is increased. In this state, the light is emitted to the projection lens 50 side.

  As described above, the intensity distribution of the illumination light emitted from the light source device 10A according to the first embodiment is made uniform by the optical integrator 15A, and the illumination conversion light 38 is provided in the image display optical system 30D. Since the light is emitted in a state in which the phase is aligned and the light use efficiency is increased by passing through the white LED 12W, when the white LED 12W is used as the plurality of LEDs 12, the white illumination light passes through the projection lens 50 from the liquid crystal panel 45. The projected white image light is displayed on the screen S better than the first embodiment without illuminance unevenness and brightness unevenness. On the other hand, when a plurality of LEDs 12 are red LEDs 12R, green LEDs 12G, and blue LEDs 12B, three primary colors are illuminated. The three primary color image lights projected from the liquid crystal panel 45 through the projection lens 50 by the above-described method without any color unevenness on the screen S from the first embodiment. The layers are well displayed.

  Next, for example, when the projection display device 1B or 1C according to the second embodiment or the third embodiment is applied, the circuit operation in the projection display device 1B or 1C will be described with reference to FIGS.

FIG. 9 is a diagram for explaining the operation of the LED drive circuit and the liquid crystal panel drive circuit when white LEDs are used as a plurality of LEDs in the light source device in the projection type display device of Example 2 or Example 3.
FIG. 10 shows a projection type display device according to the second or third embodiment. In the case where a red LED, a green LED, and a blue LED are used as a plurality of LEDs in the light source device, the RGB-LED driving circuit and the liquid crystal panel driving circuit are shown. A diagram for explaining the operation,
FIG. 11 shows a color sequence control circuit and RGB-LED time-division drive when a red LED, a green LED, and a blue LED are used as a plurality of LEDs in the light source device in the projection type display device of Example 2 or Example 3. It is a figure explaining the operation | movement of a circuit and a liquid crystal panel time division drive circuit.

  First, as shown in FIG. 9, in the projection display device 10 </ b> B or 10 </ b> C according to the second embodiment or the third embodiment, a plurality of white LEDs 12 </ b> W are driven by the LED driving circuit 61 as the plurality of LEDs 12. The white light emitted from the plurality of white LEDs 12W is made uniform in intensity distribution by the light integrator 15A using the rod integrator system or the light integrator 15B using the lens array system, and the phase of the white light after passing through the polarization conversion plate 20 is changed. The light transmission type liquid crystal panel 45 having the R, G, B color filter 46 is emitted to the image display optical system 30B or 30C side in a state where the light use efficiency is improved. Here, the RGB video signal is supplied to the liquid crystal panel drive circuit 62 to drive the liquid crystal panel 45, whereby the color image is light-modulated and projected onto the screen S by the projection lens 50.

  Next, as shown in FIG. 10, in the projection display device 10 </ b> B or 10 </ b> C according to the second or third embodiment, a plurality of red LEDs 12 </ b> R, green LEDs 12 </ b> G, and blue LEDs 12 </ b> B are driven by the RGB-LED driving circuit 63 as the plurality of LEDs 12. Has been. The red light, green light, and blue light emitted from the plurality of red LEDs 12R, green LEDs 12G, and blue LEDs 12B are made uniform in intensity distribution by the light integrator 15A using the rod integrator system or the light integrator 15B using the lens array system, and Then, after passing through the polarization conversion plate 20, it is emitted to the image display optical system 30B or 30C side as white uniform illumination light that is color-combined in a state in which the phases are aligned and the light use efficiency is increased, and this image display optical system The light transmission type liquid crystal panel 45 having the R, G, B color filter 46 is illuminated in 30B or 30C, and the RGB video signal is supplied to the liquid crystal panel drive circuit 62 to drive the liquid crystal panel 45. The light is modulated into a color image and projected onto the screen S by the projection lens 50. At this time, by using a plurality of red LEDs 12R, green LEDs 12G, and blue LEDs 12B, complex color image color control is possible.

  Next, as shown in FIG. 11, in the projection type display device 10B or 10C according to the second or third embodiment, a plurality of red LEDs 12R, green LEDs 12G, and blue LEDs 12B are used as commands of the color sequence control circuit 65 as the plurality of LEDs 12. Based on the RGB-time division LED drive circuit 65, the time division drive is performed. The intensity distribution of red light, green light, and blue light emitted from the plurality of red LEDs 12R, green LEDs 12G, and blue LEDs 12B in a time-sharing manner is made uniform by the light integrator 15A using the rod integrator method or the light integrator 15B using the lens array method. In addition, after passing through the polarization conversion plate 20, it is emitted in a time-division manner to the image display optical system 30B or 30C side in a state where the phase is aligned and the light use efficiency is increased, and within the image display optical system 30B or 30C The light transmissive liquid crystal panel 45 is illuminated. Here, based on the command of the color sequence control circuit 65, the R video signal, the G video signal, and the B signal are synchronized with the red light, green light, and blue light from the plurality of red LEDs 12R, green LEDs 12G, and blue LEDs 12B. The video signal is supplied to the liquid crystal panel time division drive circuit 62 in a time division manner, and the liquid crystal panel 45 is driven in a time division manner, whereby it is optically modulated into an RGB three-color image. The image projected from the liquid crystal panel 45 by the projection lens 50 is projected on the screen S in order of R, G, and B colors, and is recognized as a color image that is time-integrated in human vision.

  FIG. 12 is a configuration diagram showing an example in which the light source device according to the first embodiment of the present invention is applied to the projection display device according to the fifth embodiment.

  As shown in FIG. 12, the light source device 10 </ b> A according to the first embodiment of the present invention can enlarge and project an image using a single-plate light reflection type DMD (Digital Micromirror Device) 77. 5 is applied to the projection type display device 1E. At this time, the projection display apparatus 1E of Example 5 is roughly configured by a light source device 10A, an image display optical system 70, and a projection lens 50 serving as a projection optical system.

  In the fifth embodiment, the light source device 10A of the first embodiment described above is applied, and the printed wiring board 11 includes a plurality of red LEDs 12R, green LEDs 12G, and blue LEDs 12B as the plurality of LEDs 12. The rectangular holes 11a are arranged according to the ratio of the light emission luminance. The red LED 12R, green LED 12G, and blue LED 12B are time-division driven by the RGB-LED time-division drive circuit 65 via the wiring connector 13, and are time-divisionally divided from the red LED 12R, green LED 12G, and blue LED 12B. The emitted red light, green light, and blue light are condensed on the light incident end portion of the light integrator 15 by a reflective condensing mirror 17 having a concave spherical reflecting surface 17 a through a plurality of condensing lenses 16. . Further, since the optical integrator 15 in the light source device 10A uses the rod integrator type optical integrator 15A, no polarization conversion plate is provided in close contact with or close to the light emitting end 15d of the optical integrator 15A.

  Here, an image display optical system 70 having a form different from that of the first embodiment is installed on the light emitting end 15d side of the optical integrator 15A.

  That is, the above-described image display optical system 70 includes, in order from the light exit end 15d side of the optical integrator 15A, the exit lens 71, the relay lens 72, the condenser lens 73, the reflection mirrors 74 and 75, the lens 76, A DMD (Digital Micromirror Device) 77 in which a large number of minute movable mirrors are integrated on one chip is provided. Further, a projection lens 50 serving as a projection optical system is installed on the light exit side of the DMD 77.

  At this time, the red LED 12R, the green LED 12G, and the blue LED 12B arranged on the printed wiring board 11 in accordance with the ratio of the emission luminance are arranged in a mottled pattern. Yes, when the three colors are turned on simultaneously, the illumination light has a mottled pattern with a large amount of unevenness due to the difference in distribution degree. However, the red LED 12R, the green LED 12G, and the blue light that are time-division driven by the RGB-LED time-division drive circuit 65. Each color light from the LED 12B is multiple-reflected by the reflecting surface 15b1 formed in the quadrangular columnar through hole 15b of the quadrangular columnar frame portion 15a of the light integrator 15A to obtain illumination light having a uniform intensity distribution.

  The illumination light having a uniform intensity distribution emitted from the light exit end 15d of the optical integrator 15A passes through the exit lens 71, the relay lens 72, and the condenser lens 73 in this order, and is three-dimensionally crossed in front of the projection lens 5. The image light that is incident on the DMD 77 from an oblique direction through the reflection mirrors 74 and 75 and the lens 76 attached thereto and is reflected by the DMD 77 and modulated for each of R, G, and B by time-division driving is projected by the projection lens 50. Since the image light projected on the screen (not shown) and projected on the screen is integrated in human vision by high-speed repetition by time-division driving and recognized as a full-color image, the three primary color image lights are It is displayed well on a screen (not shown) without color unevenness.

  FIG. 13 is a configuration diagram illustrating an example in which the light source device according to the second or third embodiment of the present invention is applied to the projection display device according to the sixth embodiment.

  As shown in FIG. 13, the light source device 10B or 10C according to the second or third embodiment of the present invention uses a three-plate light reflective liquid crystal panel 90R, 90G, or 90G corresponding to RGB. Is applied to the projection type display device 1F of Example 6. At this time, the projection type display apparatus 1F of Example 6 is roughly configured by a light source device 10B or 10C, a color separation and color synthesis optical system 80, and a projection lens (not shown) serving as a projection optical system. .

  In the sixth embodiment, the light source device 10B or 10C of the second or third embodiment described above is applied, and the printed wiring board 11 includes a plurality of white LEDs 12W as the plurality of LEDs 12. The rectangular hole 11a is arranged at the center. Since the light integrator 15 in the light source device 10B or 10C uses the rod integrator type optical integrator 15A or the lens array type optical integrator 15B, the light integrator 15B closely contacts or approaches the light emitting end 15d of the optical integrator 15A or 15B. A polarization conversion plate 20 is provided.

  At this time, the intensity of each white light emitted from the plurality of white LEDs 12W is made uniform by the rod integrator type optical integrator 15A or the lens array type optical integrator 15B, and after passing through the polarization conversion plate 20, Are emitted as s-polarized white light composed of Rs light, Gs light, and Bs light to the color separation and color synthesis optical system 80 side described below.

  Here, unlike the first embodiment, a color separation and color synthesis optical system 80 is installed on the light exit end 15d side of the optical integrator 15A or 15B.

  The image display optical system 80 described above has a function of separating the white light from the light source device 10B or 10C into RGB three primary colors, and a light reflection type of each color corresponding to the color-separated red light, green light, and blue light. It has a function of color synthesis after being reflected by the liquid crystal panels 90R, 90G, 90G.

  That is, in the image display optical system 80, when the four first to fourth polarizing beam splitters 81 to 84 are viewed in plan view from the upper surface side, the polarization separating surfaces 81a to 84a of the polarizing beam splitters are X. It is arranged in a letter shape. At this time, the second polarizing beam splitter 82 is disposed on the right side of the first polarizing beam splitter 81, the third polarizing beam splitter 83 is disposed above the first polarizing beam splitter 81, and the second polarizing beam A fourth polarizing beam splitter 84 is disposed above the beam splitter 82 and to the right of the third polarizing beam splitter 83. Then, the first polarization beam splitter 81 side faces the polarization conversion plate 20 closely attached to the light exit end 15d of the optical integrator 15A or 15B via a G light polarization conversion plate 85, which will be described later, while the fourth polarization beam The splitter 84 side faces a projection lens (not shown). At this time, each of the polarization separation surfaces 81a to 84a of the first to fourth polarization beam splits 81 to 84 transmits a p-polarized light and reflects a s-polarized light in a rectangular shape. It is formed along the diagonal line.

  The first polarizing beam splitter 81 on the light source unit side where white light from the light source device 10B or 10C is incident and the fourth polarizing beam splitter 84 on the projection lens side that emits color synthesized light are formed in a large size. In addition, the second and third polarization beam splitters 82 and 83 are slightly smaller than the first and fourth polarization beam splitters 81 and 84.

  Further, a light-reflecting liquid crystal panel 90G for G light is disposed to face the right side surface of the small-sized second polarizing beam splitter 82, and is opposed to the upper surface and left side surface of the small-sized third polarizing beam splitter 83. Then, the light reflection type liquid crystal panel 90R for R light and the light reflection type liquid crystal panel 90B for B light are arranged orthogonally to each other, and each of the light reflection type liquid crystal panels 90R, 90G, 90B is second, third. The size of the polarizing beam splitters 82 and 83 is reduced.

  A G light polarization conversion plate 85 having a function of rotating the polarization plane of the G light by 90 ° is installed on the light incident surface of the first polarization beam splitter 81 on the light source unit side. Further, between the first polarization beam splitter 81 and the third polarization beam splitter 83, an R light polarization conversion plate 86 having a function of rotating the polarization plane of the R light by 90 ° is installed. Further, between the third polarization beam splitter 83 and the fourth polarization beam splitter 84, an R light polarization conversion plate 87 having a function of rotating the polarization plane of the R light by 90 ° is installed. A G light polarization conversion plate 88 having a function of rotating the polarization plane of the G light by 90 ° is installed on the light exit surface of the fourth polarization beam splitter 84.

  Then, when white light composed of Rs light, Gs light, and Bs light of s-polarized light obtained from the light source unit 10B or 10C is incident from the light incident surface side of the first polarization beam splitter 81, each optical path shown in the figure is obtained. After that, the color synthesized light obtained by synthesizing the p-polarized Rp, Gp light, and Bp light is emitted from the light exit surface side of the fourth polarizing beam splitter 84 to the projection lens side. It can be projected on the screen shown.

  In the case where the light source devices 10A to 10C of the first to third embodiments are applied to a projection display device that can project an enlarged image using a three-plate light transmission type liquid crystal panel corresponding to RGB. Although not shown, the red light from the plurality of red LEDs 12R attached to the R light printed wiring board is sequentially passed through the plurality of condensing lenses 16, the reflection condensing mirror 17, and the light integrator 15 (15A or 15B). Green light from a plurality of green LEDs 12G mounted on a G light printed circuit board is applied to a light transmission type liquid crystal panel for R light, a plurality of condensing lenses 16, a reflection condensing mirror 17, and an optical integrator 15 (15A or 15B). The blue light from the plurality of blue LEDs 12B attached to the printed circuit board for B light is transmitted to the light transmission type liquid crystal panel for G light through the plurality of condensing lenses 16 and the reflection collection. The light transmissive liquid crystal panel for B light is irradiated through the mirror 17 and the light integrator 15 (15A or 15B) in this order, and then the R light, G light, B emitted from the light transmissive liquid crystal panel of each color The light may be color-combined by a combining prism (not shown) and the color-combined light may be projected on a screen by a projection lens.

It is the block diagram which showed the example which applied the light source device of Example 1 which concerns on this invention to the projection type display apparatus of Example 1. FIG. In the light source device of Example 1 which concerns on this invention, it is the perspective view which showed the state which attached the some white LED which radiate | emits white light as a some semiconductor light emitting element, and an optical integrator to the printed wiring board. In the light source device according to the first embodiment of the present invention, a plurality of red LEDs, green LEDs, blue LEDs and light integrators, which emit red light, green light, and blue light, respectively, are attached to a printed wiring board as a plurality of semiconductor light emitting elements. It is the perspective view which showed the state. The light source device of Example 1 which concerns on this invention WHEREIN: The figure which showed typically the state state in which the light from several semiconductor light-emitting elements is repeatedly reflected and uniformed by the reflective surface formed in the square columnar frame part of an optical integrator It is. In the light source device of Example 1 which concerns on this invention, the state which equalizes the light from a several semiconductor light-emitting device with the relay lens and two microlens array which were accommodated in the square columnar frame part of an optical integrator is shown typically. It is a figure. It is the block diagram which showed the example which applied the light source device of Example 2 which concerns on this invention to the projection type display apparatus of Example 2. FIG. It is the block diagram which showed the example which applied the light source device of Example 3 which concerns on this invention to the projection type display apparatus of Example 3. FIG. It is the block diagram which showed the example which applied the light source device of Example 1 which concerns on this invention to the projection type display apparatus of Example 4. FIG. In the projection type display apparatus of Example 2 or Example 3, it is a figure for demonstrating operation | movement of an LED drive circuit and a liquid crystal panel drive circuit, when white LED is used as several LED in a light source device. In the projection type display device of Example 2 or Example 3, the operation of the RGB-LED drive circuit and the liquid crystal panel drive circuit will be described when a red LED, a green LED, and a blue LED are used as a plurality of LEDs in the light source device. It is a figure for doing. In the projection type display device of Example 2 or Example 3, when a red LED, a green LED, and a blue LED are used as a plurality of LEDs in the light source device, a color sequence control circuit, an RGB-LED time-division drive circuit, and a liquid crystal It is a figure explaining operation | movement of a panel time division drive circuit. It is the block diagram which showed the example which applied the light source device of Example 1 which concerns on this invention to the projection type display apparatus of Example 5. FIG. It is the block diagram which showed the example which applied the light source device of Example 2 or Example 3 which concerns on this invention to the projection type display apparatus of Example 6. FIG. It is the block diagram which showed the image display apparatus of the prior art example 1. (A), (b) is a figure for demonstrating the light source device of the prior art example 2. FIG.

Explanation of symbols

1A to 1F: Projection type display devices of Examples 1 to 6,
10A to 10C: Light source device of Examples 1 to 3,
DESCRIPTION OF SYMBOLS 11 ... Printed wiring board, 11a ... Rectangular hole, 11b ... One side, 11c ... The other side, 12 ... Multiple semiconductor light-emitting devices (multiple LED),
12R ... Red LED, 12G ... Green LED, 12B ... Blue LED, 12W ... White LED,
13 ... Connector for wiring, 14 ... Heat sink (heat sink),
15 (15A or 15B) ... optical integrator,
15a ... Square columnar frame portion, 15b ... Square columnar through-hole, 15b1 ... Reflecting surface,
15c ... light incident end, 15d ... light exit end,
16 ... Condensing lens, 17 ... Reflective condensing mirror, 17a ... Reflecting surface,
18 ... Relay lens,
19A, 19B ... 1st, 2nd micro lens array,
20: Polarization conversion plate,
30A to 30D: Image display optical system of Examples 1 to 4,
45 ... LCD panel,
50 ... Projection lens,
70: Image display optical system of Example 5,
77 ... DMD (Digital Micromirror Device),
80: Color separation and color synthesis optical system of Example 6,
81-84 ... 1st-4th polarizing beam splitter,
90R, 90G, 90B ... light reflection type liquid crystal panel,
S ... Screen.

Claims (3)

In the light source device applied to the projection display device,
A wiring board having a through-hole formed therein;
A plurality of semiconductor light emitting devices attached to one surface of the wiring board around the hole;
Light that is fitted in the hole of the wiring board and has a light incident end projecting toward the one surface of the wiring board and a light emitting end projecting toward the other surface of the wiring board An integrator,
A plurality of condensing lenses which are respectively provided facing the plurality of semiconductor light emitting elements and convert each light emitted from the plurality of semiconductor light emitting elements into parallel light;
A reflective condensing mirror that is provided opposite to the plurality of condensing lenses and that reflects each parallel light from the plurality of condensing lenses and condenses the light in the vicinity of the light incident end of the optical integrator; With
The optical integrator has a through-hole formed in the frame portion from the light incident end portion toward the light emitting end portion, and is condensed by the reflection / condensing mirror and incident from the light incident end portion. A light source device characterized in that a reflection surface is formed along an inner wall surface of the through hole in order to make the intensity distribution of the emitted light uniform and output from the light emitting end. In the light source device applied to the projection display device,
A wiring board having a through-hole formed therein;
A plurality of semiconductor light emitting devices attached to one surface of the wiring board around the hole;
Light that is fitted in the hole of the wiring board and has a light incident end projecting toward the one surface of the wiring board and a light emitting end projecting toward the other surface of the wiring board An integrator,
A plurality of condensing lenses which are respectively provided facing the plurality of semiconductor light emitting elements and convert each light emitted from the plurality of semiconductor light emitting elements into parallel light;
A reflective condensing mirror that is provided opposite to the plurality of condensing lenses and that reflects each parallel light from the plurality of condensing lenses and condenses the light in the vicinity of the light incident end of the optical integrator; With
The optical integrator has a through-hole formed in the frame portion from the light incident end portion toward the light emitting end portion, and is condensed by the reflection / condensing mirror and incident from the light incident end portion. A light source device characterized in that a relay lens and two microlens arrays are accommodated in the through hole so as to make the intensity distribution of the emitted light uniform and emit from the light emitting end. The light source device according to claim 1 or 2,
A light source device, wherein a polarization conversion plate is provided in close contact with or close to the light emitting end of the optical integrator.

Images